diff options
Diffstat (limited to 'testing/web-platform/tests/streams/readable-streams/tee.any.js')
| -rw-r--r-- | testing/web-platform/tests/streams/readable-streams/tee.any.js | 479 |
1 files changed, 479 insertions, 0 deletions
diff --git a/testing/web-platform/tests/streams/readable-streams/tee.any.js b/testing/web-platform/tests/streams/readable-streams/tee.any.js new file mode 100644 index 0000000000..00397932f4 --- /dev/null +++ b/testing/web-platform/tests/streams/readable-streams/tee.any.js @@ -0,0 +1,479 @@ +// META: global=window,worker +// META: script=../resources/rs-utils.js +// META: script=../resources/test-utils.js +// META: script=../resources/recording-streams.js +// META: script=../resources/rs-test-templates.js +'use strict'; + +test(() => { + + const rs = new ReadableStream(); + const result = rs.tee(); + + assert_true(Array.isArray(result), 'return value should be an array'); + assert_equals(result.length, 2, 'array should have length 2'); + assert_equals(result[0].constructor, ReadableStream, '0th element should be a ReadableStream'); + assert_equals(result[1].constructor, ReadableStream, '1st element should be a ReadableStream'); + +}, 'ReadableStream teeing: rs.tee() returns an array of two ReadableStreams'); + +promise_test(t => { + + const rs = new ReadableStream({ + start(c) { + c.enqueue('a'); + c.enqueue('b'); + c.close(); + } + }); + + const branch = rs.tee(); + const branch1 = branch[0]; + const branch2 = branch[1]; + const reader1 = branch1.getReader(); + const reader2 = branch2.getReader(); + + reader2.closed.then(t.unreached_func('branch2 should not be closed')); + + return Promise.all([ + reader1.closed, + reader1.read().then(r => { + assert_object_equals(r, { value: 'a', done: false }, 'first chunk from branch1 should be correct'); + }), + reader1.read().then(r => { + assert_object_equals(r, { value: 'b', done: false }, 'second chunk from branch1 should be correct'); + }), + reader1.read().then(r => { + assert_object_equals(r, { value: undefined, done: true }, 'third read() from branch1 should be done'); + }), + reader2.read().then(r => { + assert_object_equals(r, { value: 'a', done: false }, 'first chunk from branch2 should be correct'); + }) + ]); + +}, 'ReadableStream teeing: should be able to read one branch to the end without affecting the other'); + +promise_test(() => { + + const theObject = { the: 'test object' }; + const rs = new ReadableStream({ + start(c) { + c.enqueue(theObject); + } + }); + + const branch = rs.tee(); + const branch1 = branch[0]; + const branch2 = branch[1]; + const reader1 = branch1.getReader(); + const reader2 = branch2.getReader(); + + return Promise.all([reader1.read(), reader2.read()]).then(values => { + assert_object_equals(values[0], values[1], 'the values should be equal'); + }); + +}, 'ReadableStream teeing: values should be equal across each branch'); + +promise_test(t => { + + const theError = { name: 'boo!' }; + const rs = new ReadableStream({ + start(c) { + c.enqueue('a'); + c.enqueue('b'); + }, + pull() { + throw theError; + } + }); + + const branches = rs.tee(); + const reader1 = branches[0].getReader(); + const reader2 = branches[1].getReader(); + + reader1.label = 'reader1'; + reader2.label = 'reader2'; + + return Promise.all([ + promise_rejects_exactly(t, theError, reader1.closed), + promise_rejects_exactly(t, theError, reader2.closed), + reader1.read().then(r => { + assert_object_equals(r, { value: 'a', done: false }, 'should be able to read the first chunk in branch1'); + }), + reader1.read().then(r => { + assert_object_equals(r, { value: 'b', done: false }, 'should be able to read the second chunk in branch1'); + + return promise_rejects_exactly(t, theError, reader2.read()); + }) + .then(() => promise_rejects_exactly(t, theError, reader1.read())) + ]); + +}, 'ReadableStream teeing: errors in the source should propagate to both branches'); + +promise_test(() => { + + const rs = new ReadableStream({ + start(c) { + c.enqueue('a'); + c.enqueue('b'); + c.close(); + } + }); + + const branches = rs.tee(); + const branch1 = branches[0]; + const branch2 = branches[1]; + branch1.cancel(); + + return Promise.all([ + readableStreamToArray(branch1).then(chunks => { + assert_array_equals(chunks, [], 'branch1 should have no chunks'); + }), + readableStreamToArray(branch2).then(chunks => { + assert_array_equals(chunks, ['a', 'b'], 'branch2 should have two chunks'); + }) + ]); + +}, 'ReadableStream teeing: canceling branch1 should not impact branch2'); + +promise_test(() => { + + const rs = new ReadableStream({ + start(c) { + c.enqueue('a'); + c.enqueue('b'); + c.close(); + } + }); + + const branches = rs.tee(); + const branch1 = branches[0]; + const branch2 = branches[1]; + branch2.cancel(); + + return Promise.all([ + readableStreamToArray(branch1).then(chunks => { + assert_array_equals(chunks, ['a', 'b'], 'branch1 should have two chunks'); + }), + readableStreamToArray(branch2).then(chunks => { + assert_array_equals(chunks, [], 'branch2 should have no chunks'); + }) + ]); + +}, 'ReadableStream teeing: canceling branch2 should not impact branch1'); + +templatedRSTeeCancel('ReadableStream teeing', (extras) => { + return new ReadableStream({ ...extras }); +}); + +promise_test(t => { + + let controller; + const stream = new ReadableStream({ start(c) { controller = c; } }); + const [branch1, branch2] = stream.tee(); + + const error = new Error(); + error.name = 'distinctive'; + + // Ensure neither branch is waiting in ReadableStreamDefaultReaderRead(). + controller.enqueue(); + controller.enqueue(); + + return delay(0).then(() => { + // This error will have to be detected via [[closedPromise]]. + controller.error(error); + + const reader1 = branch1.getReader(); + const reader2 = branch2.getReader(); + + return Promise.all([ + promise_rejects_exactly(t, error, reader1.closed, 'reader1.closed should reject'), + promise_rejects_exactly(t, error, reader2.closed, 'reader2.closed should reject') + ]); + }); + +}, 'ReadableStream teeing: erroring a teed stream should error both branches'); + +promise_test(() => { + + let controller; + const rs = new ReadableStream({ + start(c) { + controller = c; + } + }); + + const branches = rs.tee(); + const reader1 = branches[0].getReader(); + const reader2 = branches[1].getReader(); + + const promise = Promise.all([reader1.closed, reader2.closed]); + + controller.close(); + return promise; + +}, 'ReadableStream teeing: closing the original should immediately close the branches'); + +promise_test(t => { + + let controller; + const rs = new ReadableStream({ + start(c) { + controller = c; + } + }); + + const branches = rs.tee(); + const reader1 = branches[0].getReader(); + const reader2 = branches[1].getReader(); + + const theError = { name: 'boo!' }; + const promise = Promise.all([ + promise_rejects_exactly(t, theError, reader1.closed), + promise_rejects_exactly(t, theError, reader2.closed) + ]); + + controller.error(theError); + return promise; + +}, 'ReadableStream teeing: erroring the original should immediately error the branches'); + +promise_test(async t => { + + let controller; + const rs = new ReadableStream({ + start(c) { + controller = c; + } + }); + + const [reader1, reader2] = rs.tee().map(branch => branch.getReader()); + const cancelPromise = reader2.cancel(); + + controller.enqueue('a'); + + const read1 = await reader1.read(); + assert_object_equals(read1, { value: 'a', done: false }, 'first read() from branch1 should fulfill with the chunk'); + + controller.close(); + + const read2 = await reader1.read(); + assert_object_equals(read2, { value: undefined, done: true }, 'second read() from branch1 should be done'); + + await Promise.all([ + reader1.closed, + cancelPromise + ]); + +}, 'ReadableStream teeing: canceling branch1 should finish when branch2 reads until end of stream'); + +promise_test(async t => { + + let controller; + const theError = { name: 'boo!' }; + const rs = new ReadableStream({ + start(c) { + controller = c; + } + }); + + const [reader1, reader2] = rs.tee().map(branch => branch.getReader()); + const cancelPromise = reader2.cancel(); + + controller.error(theError); + + await Promise.all([ + promise_rejects_exactly(t, theError, reader1.read()), + cancelPromise + ]); + +}, 'ReadableStream teeing: canceling branch1 should finish when original stream errors'); + +promise_test(async () => { + + const rs = new ReadableStream({}); + + const [branch1, branch2] = rs.tee(); + + const cancel1 = branch1.cancel(); + await flushAsyncEvents(); + const cancel2 = branch2.cancel(); + + await Promise.all([cancel1, cancel2]); + +}, 'ReadableStream teeing: canceling both branches in sequence with delay'); + +promise_test(async t => { + + const theError = { name: 'boo!' }; + const rs = new ReadableStream({ + cancel() { + throw theError; + } + }); + + const [branch1, branch2] = rs.tee(); + + const cancel1 = branch1.cancel(); + await flushAsyncEvents(); + const cancel2 = branch2.cancel(); + + await Promise.all([ + promise_rejects_exactly(t, theError, cancel1), + promise_rejects_exactly(t, theError, cancel2) + ]); + +}, 'ReadableStream teeing: failing to cancel when canceling both branches in sequence with delay'); + +test(t => { + + // Copy original global. + const oldReadableStream = ReadableStream; + const getReader = ReadableStream.prototype.getReader; + + const origRS = new ReadableStream(); + + // Replace the global ReadableStream constructor with one that doesn't work. + ReadableStream = function() { + throw new Error('global ReadableStream constructor called'); + }; + t.add_cleanup(() => { + ReadableStream = oldReadableStream; + }); + + // This will probably fail if the global ReadableStream constructor was used. + const [rs1, rs2] = origRS.tee(); + + // These will definitely fail if the global ReadableStream constructor was used. + assert_not_equals(getReader.call(rs1), undefined, 'getReader should work on rs1'); + assert_not_equals(getReader.call(rs2), undefined, 'getReader should work on rs2'); + +}, 'ReadableStreamTee should not use a modified ReadableStream constructor from the global object'); + +promise_test(t => { + + const rs = recordingReadableStream({}, { highWaterMark: 0 }); + + // Create two branches, each with a HWM of 1. This should result in one + // chunk being pulled, not two. + rs.tee(); + return flushAsyncEvents().then(() => { + assert_array_equals(rs.events, ['pull'], 'pull should only be called once'); + }); + +}, 'ReadableStreamTee should not pull more chunks than can fit in the branch queue'); + +promise_test(t => { + + const rs = recordingReadableStream({ + pull(controller) { + controller.enqueue('a'); + } + }, { highWaterMark: 0 }); + + const [reader1, reader2] = rs.tee().map(branch => branch.getReader()); + return Promise.all([reader1.read(), reader2.read()]) + .then(() => { + assert_array_equals(rs.events, ['pull', 'pull'], 'pull should be called twice'); + }); + +}, 'ReadableStreamTee should only pull enough to fill the emptiest queue'); + +promise_test(t => { + + const rs = recordingReadableStream({}, { highWaterMark: 0 }); + const theError = { name: 'boo!' }; + + rs.controller.error(theError); + + const [reader1, reader2] = rs.tee().map(branch => branch.getReader()); + + return flushAsyncEvents().then(() => { + assert_array_equals(rs.events, [], 'pull should not be called'); + + return Promise.all([ + promise_rejects_exactly(t, theError, reader1.closed), + promise_rejects_exactly(t, theError, reader2.closed) + ]); + }); + +}, 'ReadableStreamTee should not pull when original is already errored'); + +for (const branch of [1, 2]) { + promise_test(t => { + + const rs = recordingReadableStream({}, { highWaterMark: 0 }); + const theError = { name: 'boo!' }; + + const [reader1, reader2] = rs.tee().map(branch => branch.getReader()); + + return flushAsyncEvents().then(() => { + assert_array_equals(rs.events, ['pull'], 'pull should be called once'); + + rs.controller.enqueue('a'); + + const reader = (branch === 1) ? reader1 : reader2; + return reader.read(); + }).then(() => flushAsyncEvents()).then(() => { + assert_array_equals(rs.events, ['pull', 'pull'], 'pull should be called twice'); + + rs.controller.error(theError); + + return Promise.all([ + promise_rejects_exactly(t, theError, reader1.closed), + promise_rejects_exactly(t, theError, reader2.closed) + ]); + }).then(() => flushAsyncEvents()).then(() => { + assert_array_equals(rs.events, ['pull', 'pull'], 'pull should be called twice'); + }); + + }, `ReadableStreamTee stops pulling when original stream errors while branch ${branch} is reading`); +} + +promise_test(t => { + + const rs = recordingReadableStream({}, { highWaterMark: 0 }); + const theError = { name: 'boo!' }; + + const [reader1, reader2] = rs.tee().map(branch => branch.getReader()); + + return flushAsyncEvents().then(() => { + assert_array_equals(rs.events, ['pull'], 'pull should be called once'); + + rs.controller.enqueue('a'); + + return Promise.all([reader1.read(), reader2.read()]); + }).then(() => flushAsyncEvents()).then(() => { + assert_array_equals(rs.events, ['pull', 'pull'], 'pull should be called twice'); + + rs.controller.error(theError); + + return Promise.all([ + promise_rejects_exactly(t, theError, reader1.closed), + promise_rejects_exactly(t, theError, reader2.closed) + ]); + }).then(() => flushAsyncEvents()).then(() => { + assert_array_equals(rs.events, ['pull', 'pull'], 'pull should be called twice'); + }); + +}, 'ReadableStreamTee stops pulling when original stream errors while both branches are reading'); + +promise_test(async () => { + + const rs = recordingReadableStream(); + + const [reader1, reader2] = rs.tee().map(branch => branch.getReader()); + const branch1Reads = [reader1.read(), reader1.read()]; + const branch2Reads = [reader2.read(), reader2.read()]; + + await flushAsyncEvents(); + rs.controller.enqueue('a'); + rs.controller.close(); + + assert_object_equals(await branch1Reads[0], { value: 'a', done: false }, 'first chunk from branch1 should be correct'); + assert_object_equals(await branch2Reads[0], { value: 'a', done: false }, 'first chunk from branch2 should be correct'); + + assert_object_equals(await branch1Reads[1], { value: undefined, done: true }, 'second read() from branch1 should be done'); + assert_object_equals(await branch2Reads[1], { value: undefined, done: true }, 'second read() from branch2 should be done'); + +}, 'ReadableStream teeing: enqueue() and close() while both branches are pulling'); |